By default, you’ll see 4 products displayed in the related products block:

In order to change the number of related products on the product page, you need to take the following steps:

Open the templates/themeXXX/html/com_virtuemart/sublayouts/customfieldsrelatedprod.php file using your favorite code editor.

Scroll to the bottom of the file and find the embedded JavaScript code which initializes the Owl Carousel. You will see 4 variables that define the number of related products for different device widths:

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